title: A diagnostic challenge: dilated pupil.
abstract: OBJECTIVE
  Dilated pupil is a diagnostic challenge encountered by neurologists and ophthalmologists. The aim of this review is to provide an overview of the current data and guidelines concerning dilated pupils.
  
  
  RESULTS
  The majority of recent reports on dilated pupils are indicative of several medical conditions that require evaluation. The topical synthetic parasympatholytic agents; local contamination of antihistamines with their antimuscarinic effects; atropine, scopolamine, and tropane alkaloids in all species of Datura plants may produce mydriasis.
  
  
  CONCLUSIONS
  The causes of pupillary dilatation can be unilateral, bilateral, and transient. The clinical approach to dilated pupils requires stepwise evaluation, and based on the findings, unnecessary and costly procedures can be avoided.
authors.affiliation: aDepartment of Neurology, Faculty of Medicine, Gazi University bDepartment of Neurology, Neuro-Ophthalmology Unit, Institute of Neurological Sciences, Hacettepe University, Ankara, Turkey cDepartment of Neurology, Faculty of Medicine, Neuro-ophthalmology Unit, Hacettepe University, Ankara, Turkey.
authors.forename: Hale Z Batur
authors.initials: HZ
authors.lastname: Caglayan
authors.forename: Ilksen A
authors.initials: IA
authors.lastname: Colpak
authors.forename: Tulay
authors.initials: T
authors.lastname: Kansu
mesh_terms: D006801:Humans; D015878:Mydriasis / Q000139:chemically induced / Q000175:diagnosis* / Q000209:etiology; D009883:Ophthalmic Solutions / Q000009:adverse effects; D004364:Pharmaceutical Preparations; D011680:Pupil / Q000187:drug effects
chemical_list: D009883:Ophthalmic Solutions; D004364:Pharmaceutical Preparations